Table 2.
Modified radical mastectomies and variations based on lymph node count restriction in the National Cancer Database, 2010–2019
| Ductal | Lobular | p | ||
|---|---|---|---|---|
| n = 10,445 (%) | n = 1,456 (%) | |||
| Lymph nodes excised count | No LN examined | 2556 (24.5%) | 454 (31.2%) | < 0.001 |
| 1–9 LN examined | 2248 (21.5%) | 310 (21.3%) | ||
| ≥10 LN examined | 3711 (35.5%) | 455 (31.3%) | ||
| Unknown | 1930 (18.5%) | 237 (16.3%) | ||
| Median no. lymph nodes excised (IQR) | 9 (0–17) | 7 (0–15) | 0.001 | |
| Surgery types | Modified radical mastectomy | 4,230 (40.5%) | 519 (35.6%) | 0.002 |
| Total mastectomy | 1768 (16.9%) | 244 (16.8%) | ||
| Other surgery | 1280 (12.3%) | 192 (13.2%) | ||
| None | 3167 (30.3%) | 501 (34.4%) | ||
| Inclusive surgery types | MRM or TM with ≥ 10 LN excised | 4859 (46.5%) | 599 (41.1%) | < 0.001 |
| Other surgery | 2419 (23.2%) | 356 (24.5%) | ||
| None | 3167 (30.3%) | 501 (34.4%) | ||
IQR Interquartile range; LN Lymph node; MRM Modified radical mastectomy; TM Total mastectomy